The boy had been in critical condition after the explosion about 8:20 a.m. June 11 at the home on FM 1486 near Texas 105 in Dobbin, just west of Conroe.

Rescuers pulled the child as well as his 58-year-old grandmother, Jennifer Mock, and her sister, 65-year-old Lena Mock Knight, from the burning rubble that had been the home. All three had been severely burned.

Wyatt had burns to 54 percent of his body, officials said. He also has head trauma.

The cause of the explosion is still under investigation, but investigators believe it was the result of a build-up of flammable gasses in or around the home. Liquefied petroleum gas was in use at the home, they said. Investigators were trying to determine the source of the gas leak and circumstances surrounding the explosion.